1/* Copyright (C) 2001-2022 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
3
4   The GNU C Library is free software; you can redistribute it and/or
5   modify it under the terms of the GNU Lesser General Public
6   License as published by the Free Software Foundation; either
7   version 2.1 of the License, or (at your option) any later version.
8
9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, see
16   <https://www.gnu.org/licenses/>.  */
17
18#include <sysdep.h>
19#include <features.h>
20
21/* When a context set up by __makecontext() is activated, control
22   transfers to __start_context.  When we get here:
23
24	b1 = entry point of function to call
25	in0 = address of UCP to resume after function returns
26	in1 = global pointer for __start_context
27	out0 .. outN = arguments for function  */
28
29ENTRY(__start_context)
30	.prologue
31	alloc r2 = ar.pfs, 2, 0, 8, 0
32
33	.save rp, r4		// terminate call chain with a NULL rp
34	mov r4 = r0
35	;;
36
37	.body
38	br.call.sptk rp = b1
391:
40	mov gp = in1			// restore gp
41	cmp.ne p6,p0 = in0, r0		// uc_link != 0 ?
42	;;
43(p6)	mov out0 = in0
44(p6)	br.call.sptk rp = __setcontext
45.Lexit:
46	mov out0 = 0
47	br.call.sptk rp = HIDDEN_JUMPTARGET(exit)
48
491:	br.cond.sptk .Lexit
50END(__start_context)
51